Gyromagnetic compass



@me 224, 1941. J. DELsUc GYROMAGNETIC COMPASS 3 Sheets-Sheet 2 Filed June 3, 1939 Z, ///A 9J 3 8 m x 2 n if Ov 3 .u 5 9 a J Z 3 ad 1. I L I/ .z s? Uf 5, 3

////VVV// June 24, 1941. J. DELSUC GYROMAGNETIC COMPASS lFiled June '3, 1959 s sheets-sheet 3 azoteas ornotraonn'rro contrase `tanques Delano, Feria, France, assigner to Socit anonyme: ateliers d. Carpentier, Paris, France Application .tune 3, i939, Seriali No. 2ii,2'1d lin France lune il, i933 y 5 Cia. (Ci. 33-222) frnagnetic unit and for obtaining a trim stabilization of lthe magnetic unit about a horizontal axis.

In carrying out the present invention the iirst of the functions ls alone retained, and the elimination of the` disturbing eects of acceleration ls obtained by the use of a very longperiod of setting the gyroscope on the magnetic unit since accidental accelerations to which airplanes are subjected are usually of short duration. The elimination of the disturbing eii'ects of acceleration may beaccomplished by the use oi' a setting system such that any effect of rwdjusting ,the gyroscope on the magnetic unit ceases when the space separating these two elements exceeds a given angle.

A iorin of construction of the subject-matter oi lthe invention is illustrated by way oi example in the accompanying drawings, in which:

Fig. i is a vertical section thereof made through the main axis oi' the device.

Fig, 2 is a side elevation in which the casingA and a part of the movable device are sectioned laccording to line H--l of Fig. l.

Fig. 3 is a verticai section made according to line m--III or Fig. 2.

Fig, i is a horizontal section made according to line IV-iV of Fig. l. 1

The compass comprises a 'casing it in which a partial vacuum can be created and which encloses: a main frame or orientation frame i which supports the magnetic unit and the gyroscope il, it. The two devices are therefore mounted within one and the same frame, this al.- lowing a direct control of one to the other.

The magnetic unit is constituted by bar imagl net's such as 2 mounted, either rigidly, or, as shown, through the medium of a Cardan joint system 3 on a cylindrical bell i having a vertical axis. The bell il carries, according to its axis, A

the pivotal axis d hung from two pivots, a lower pivot 6, and an upper pivot l.

For damping the eventual vibrations, the fork t is supported by a spring t. The unit tis supported by a hollow column -9 the/upper part oi which is perforated with orifices it which put the interior oi .the column d in communication with lthe inner part of the bell d.

The bell d is adjusted with slight play onthe column u.

The column 9 is rigidvwith the orientation frame i.

The upper pivot 'i is carried by a cross memloer lli rigid with the :trame i.

The bell d carries, in addition to the magnetic unit 2, two nozzles i2 and i2', the orices of which are so arranged that the air jets issuing therefrom exert no reaction on the bell which is vedge which contains the unit 2 of which it Iconstitutes the damping device and which is graduated at its periphery.

The compass card i3 and the rim it of the bowl' id are juxtaposed and a glass window ii allows oi comparing their graduations through the casing it4 oi the instrument. y

The gymscopic unit is constituted by a. torus ill supported through the medium of a ball bearing in a .procession frame it. supported in its turn by the orientation frame i, by means of pivots it.

The orientation frame i is supported so as to be capable of pivoting about a vertical axis by an upper pivot it and a lower pivot 2t mounted in the casing it. The pivot it comprises a iiuidtight ioint which allows of causing the pressure oi vthe outside air to penetrate to the column ii and, to pipe-lines ii rigid with the orientation frame.

The pipe-lines 2i supply a box 22 with air, which distributes the pressure to the nozzle 23 driving the gyroscope, and to the orifices 2d of v the stabilizer.

The stabilizer comprises said orifices 2i rigid with the' orientation frame and a half-crown it rigid i with the precession frame. Said halfcrown normally covers equal portions ofthe orices 2H. but uncovers entirely one orice This frame is while closing the other when the stabilizer en- The general relative'arrangement oi` the various elements is such that, during normal operation.' the axis of rotation X X of the gryrcscope, the plane. of the edges of the rims 2l', the magnetic axis ofthe unit i, the axial plane ci the nozzles I2 and I2' are all entirely contained in the meridian plane. ln this position the air iets issuing from Si and It equally strike against the segments 2li and 'dit'.

ln the case oi a relative slow" deviation between the gyroscope and the magnetic unit, such as can be produced by driving or by procession, one et the segments '2li or 2t comes entirely under'the action of the corresponding air jet, whereas the other leavessaid action. By precession. the gyroscope (all the directions of rotation` having been determined for that purpose) comes back at this moment so as to restore its axis of rotation in the meridian plane. I

In the case of a rapid relative deviation, such as can be produced under the action of horizontal acceleration on the element of low inertia (in this case the magnetic unit), said deviation will, generally speaking, be of greatk amplitude, sumcient in any case for the segments having vanos 26, 26 of small widthgfnot to remain under the action of the returning air jets. The setting will .therefore cease during` the periods of great relative deviation.

If the horizontal acceleration is of a sumciently low value forthe returning action not to be exerted, the precession torque having been chosen small enough for the returning action to be exerted slowly, and the horizontal accelerations `of small amplitude being always of very short duration, the axis of rotation of the gyroscopewill not be deviated appreciably from the meridian plane.

The stabilizer vhas a .double function in that it maintains the plane of the precession frame It at right angles to the plane of the orientation frame I, according to the usual practice of stabilizers of this type and-it acts for eliminating certain disturbing driving or resistant torques which may act on the pivots of the orientation frame. I

If the gyro'scope is being guided by the magnetic unit: one of the segments 26 or 26 is subjected to the action of the Ajet from one of the nozzles I 2 or I2. By procession, the orientation frame I rotates about its vertical axis. If, however, in this. movement, a disturbing resistance is produced, the frame I will cease to rotate. The frame I8 will then rock, uncovering one oi Y the orifices 2t and the air jet thereof will create a reaction which will help the orientation frame I to pass the difficult' point or to overcome the ldisturbing resistance.

If it is a matter of a driving stress of frame I,

' the frame I8 willv rock in the same Way, by

precession.

In these cases, the gyroscope of disturbing forces.

In addition to what has been described above, the device according to the present invention may include an optional or compulsory number of optional or compulsory accessories.

ts as -detector operate with the cone 3l.

gear Wheel 2d.

accross center of the cover oi' the casing It. The under face oi the gear wheel i9 is provided with a conical-shaped recess d?? adapted to frictionally co- A iorked lever 3d is pivotally mounted at 33 under the cover of the casing. The lever lid is provided with pins 35 which extend 'into an annular groove 3e ofthe 'T he lever. @t is normally lifted by means of a spring Sl so that the gear wheel is held out oi contact with the cone The orientation frame G is then free to pivot about its vertical axis. The lever tid may be lowered by pressing on a knob 3&3 in order to move the gear wheel 2S against the cone iii to thereby establish the frictional coupling between'the gear wheel ce and the frame I. f

The knob t@ is also provided with a pinion 39 which engages the teeth of the gear wheel 29. Thus by rotating the lrnob :it the orientation frame I can be rotated.

It is optional to place at the apex of the orientation frame a horizontal compass card Sil for facilitating navigation.

What l claim as my invention and desire to secure by utters Patent is:

l. A gym-magnetic compass comprising, a closed casing from `which. air may be exhausted, an orientation frame pivoted in said casing about a vertical axis, a magnetic unit mounted within said frame for independent movement about said vertical axis, a bell-shaped member within said casing connected to rotate with said unit and having two diametrically opposed nozzles directed upwardly in the vertical plane of said unit, there being an air passage leading from the exterior of said casing to said nozzles, a gimbal frame pivotally mounted about a horizontal axis insaid orientation frame, a gyroscopic rotor pivotally mounted in said gimbal frame for spinning about an axis normally in the vertical magnetic plane of said unit, means spinning said rotor, a support rigid with said gimbal frame and having blades respectively arranged above said nozzles each normally equally intercepting a respective jet and so arranged as to receive the impulse of said jets only over a small angle of relative azimuthal deviation between the gyro spin axisarid magnetic unit, a stabilizing device having means forming opposed horizontal air jets carried by unit, and said compass cards being arranged cont I centrically adjacent cach other.

3. A gym-magnetic compass as claimed in claim 1 including e. graduated compass card carried by the orientation frame, said compass card being formed of red copper in the shape of a bowl having a spherical periphery portion surroundv ing the magnetic unit.

4. A gyra-magnetic compass as claimed in claim l in which the supports of the blades concome@ it sist of a, lvertical picte secured to the bci fre ct-riuht icc to the c oi oscillation then-eci ond spccedi from the verticei amc ci rotation of the orientation freinen and said im extending from raid plate to c vertical piene missing substticily through d verticci v 5. i erro-metio cpasc cicimcci im cieiim 1 scid stobiiimnr device como itl w e. circuler rib corrie@ by the bei treme cmi concentric with the inoricontci pivoting cris i@ thereof, c cylindricci member ccrrieci by the v orientation fr'e and concentric with the mori commi pivotal axis sind arranged th i, pier within scid semi-circular rib, scid cylindrical member having two orices opening ct diemetriccily opposite points acent respective edges oi seid rib, and :ci i for complying c, comtinuouc cir stream through mici member to scid ocec.

mme fr. 

